diff --git a/scripts/test-report-utils.mjs b/scripts/test-report-utils.mjs
index 7318f9cad14..0527d20aa14 100644
--- a/scripts/test-report-utils.mjs
+++ b/scripts/test-report-utils.mjs
@@ -1,5 +1,6 @@
 // Shared helpers for running Vitest JSON reports and reading duration data.
 import { spawnSync } from "node:child_process";
+import { randomUUID } from "node:crypto";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
@@ -59,6 +60,10 @@ function validateVitestJsonReport(reportPath) {
   return null;
 }
 
+function defaultVitestJsonReportPath(prefix) {
+  return path.join(os.tmpdir(), `${prefix}-${process.pid}-${Date.now()}-${randomUUID()}.json`);
+}
+
 /**
  * Runs Vitest with the JSON reporter unless an existing report was supplied.
  */
@@ -67,7 +72,7 @@ export function runVitestJsonReport({
   reportPath = "",
   prefix = "openclaw-vitest-report",
 }) {
-  const resolvedReportPath = reportPath || path.join(os.tmpdir(), `${prefix}-${Date.now()}.json`);
+  const resolvedReportPath = reportPath || defaultVitestJsonReportPath(prefix);
 
   if (!(reportPath && fs.existsSync(resolvedReportPath))) {
     const run = spawnSync(
diff --git a/test/scripts/test-report-utils.test.ts b/test/scripts/test-report-utils.test.ts
index fa73da36231..f051c55dc40 100644
--- a/test/scripts/test-report-utils.test.ts
+++ b/test/scripts/test-report-utils.test.ts
@@ -153,6 +153,42 @@ describe("scripts/test-report-utils runVitestJsonReport", () => {
     );
   });
 
+  it("uses distinct default report paths when invocations share a clock tick", async () => {
+    const { runVitestJsonReport } = await import("../../scripts/test-report-utils.mjs");
+    const reportPaths: string[] = [];
+    const nowSpy = vi.spyOn(Date, "now").mockReturnValue(1234567890);
+    spawnSyncMock.mockImplementation((_command: string, args: string[]) => {
+      const outputFileIndex = args.indexOf("--outputFile") + 1;
+      const outputFile = args[outputFileIndex];
+      reportPaths.push(outputFile);
+      fs.writeFileSync(outputFile, `${JSON.stringify({ testResults: [] })}\n`, "utf8");
+      return { status: 0 };
+    });
+
+    try {
+      runVitestJsonReport({
+        config: "test/vitest/vitest.unit.config.ts",
+      });
+      runVitestJsonReport({
+        config: "test/vitest/vitest.unit.config.ts",
+      });
+
+      expect(reportPaths).toHaveLength(2);
+      expect(reportPaths[0]).not.toBe(reportPaths[1]);
+      for (const reportPath of reportPaths) {
+        expect(path.dirname(reportPath)).toBe(os.tmpdir());
+        expect(path.basename(reportPath)).toMatch(
+          /^openclaw-vitest-report-\d+-1234567890-[0-9a-f-]+\.json$/u,
+        );
+      }
+    } finally {
+      nowSpy.mockRestore();
+      for (const reportPath of reportPaths) {
+        fs.rmSync(reportPath, { force: true });
+      }
+    }
+  });
+
   it("fails when Vitest exits successfully without writing a JSON report", async () => {
     const { runVitestJsonReport } = await import("../../scripts/test-report-utils.mjs");
     spawnSyncMock.mockReturnValue({ status: 0 });